Add regular expression and shell wildcard search facilities to man

(Debian bug #461319).
* src/whatis.c (lower): Move to ...
* lib/lower.c: ... here, with optimisation from name_to_key. New
  file.
* lib/lower.h: New file.
* src/whatis.c (word_fnmatch): Move to ...
* lib/wordfnmatch.c: ... here, with more generic argument names. New
  file.
* lib/wordfnmatch.h: New file.
* src/whatis.c (main): Factor regcomp error handling out to ...
* lib/xregcomp.c: ... here. New file.
* lib/xregcomp.h: New file.
* lib/Makefile.am (libman_a_SOURCES): Add lower.c, lower.h,
  wordfnmatch.c, wordfnmatch.h, xregcomp.c, and xregcomp.h.
* po/POTFILES.in: Add lib/xregcomp.c; remove src/globbing.c.
* libdb/db_lookup.c (name_to_key): Use lower.
  (dblookup_pattern): New function.
* libdb/db_storage.h (dblookup_pattern): Add prototype.
* src/globbing.c (end_pattern): Rename to ...
  (make_pattern): ... this. Create the whole pattern rather than
  merely appending section or extension components. Handle regexes
  if the new opts argument has the LFF_REGEX bit set.
  (match_in_directory): Take an opts disjunction rather than a
  boolean ignore_case argument; ignore_case is replaced by the
  LFF_MATCHCASE bit being unset. Handle regexes if opts has the
  LFF_REGEX bit set.
  (look_for_file): Take an opts disjunction rather than a boolean
  match_case argument; match_case is replaced by the LFF_MATCHCASE
  bit being set. Handle regexes if opts has the LFF_REGEX bit set.
  Handle shell wildcards if opts has the LFF_WILDCARD bit set (which
  simply means not shell-escaping unesc_name). Call make_pattern
  rather than end_pattern (with appropriate adjustments).
* src/globbing.h (enum look_for_file_opts): New enumeration.
  (look_for_file): Update prototype.
* src/globbing_test.c (options, parse_opt): Accept -r/--regex and
  -w/--wildcard.
  (main): Update look_for_file arguments, including passing
  LFF_REGEX or LFF_WILDCARD if the corresponding options are used.
* src/check_mandirs.c (purge_whatis, purge_missing), src/zsoelim.l
  (zsoelim_open_file): Update look_for_file arguments.
* src/whatis.c (main): Only free preg if a regular expression was
  compiled into it in the first place.
* src/man.c (options, parse_opt): Accept --regex, --wildcard, and
  --names-only. Reset corresponding variables with -D. Refuse to
  accept both --regex and --wildcard.
  (try_section): Update look_for_file arguments, including passing
  LFF_REGEX or LFF_WILDCARD if the corresponding options are used.
  (try_db): Use dblookup_pattern if --regex or --wildcard is used,
  with corresponding options.
* man/man1/man.man1 (SYNOPSIS, Finding manual pages): Document
  --regex, --wildcard, and --names-only.

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/lower.c b/lib/lower.c
new file mode 100644
index 00000000..e620fb7c
--- /dev/null
+++ b/lib/lower.c
@@ -0,0 +1,47 @@
+/*
+ * lower.c: return lower-case copy of a string
+ *
+ * Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
+ * Copyright (C) 2003, 2008 Colin Watson.
+ *
+ * This file is part of man-db.
+ *
+ * man-db is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * man-db is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with man-db; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#include <ctype.h>
+
+#include "manconfig.h"
+
+#include "lower.h"
+
+/* return lowered version of s */
+char *lower (const char *s)
+{
+	char *low, *p;
+
+	p = low = xmalloc (strlen (s) + 1);
+
+	while (*s)
+		*p++ = CTYPE (tolower, *s++);
+
+	*p = *s;
+	return low;
+}